
public class ex_3_1{
	public static void main(String[] args){
		int ken=10, yoo=-20, boo;
		boo=-yoo;
		System.out.println("*** result ***");
		System.out.println("ken =" + ken + ","+ 
						   "yoo =" + yoo + ","+ 
						   "boo =" + boo);
		System.out.println("++ken=" + (++ken) + ", ken=" + ken); 
		System.out.println("ken++=" + (ken++) + ", ken=" + ken); 
		System.out.println("--boo=" + (--boo) + ", boo=" + boo); 
		System.out.println("boo--=" + (boo--) + ", boo=" + boo); 

		
	}
}